<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>251</b></div></td><td><div><a href="index.php?section=problems&amp;id=251" style="text-decoration:none;" title="Click to view problem">
Cardano Triplets
</a></div></td><td><div style="text-align:center;">412</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>252</b></div></td><td><div><a href="index.php?section=problems&amp;id=252" style="text-decoration:none;" title="Click to view problem">
Convex Holes
</a></div></td><td><div style="text-align:center;">320</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>253</b></div></td><td><div><a href="index.php?section=problems&amp;id=253" style="text-decoration:none;" title="Click to view problem">
Tidying up
</a></div></td><td><div style="text-align:center;">279</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>254</b></div></td><td><div><a href="index.php?section=problems&amp;id=254" style="text-decoration:none;" title="Click to view problem">
Sums of Digit Factorials
</a></div></td><td><div style="text-align:center;">317</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>255</b></div></td><td><div><a href="index.php?section=problems&amp;id=255" style="text-decoration:none;" title="Click to view problem">
Rounded Square Roots
</a></div></td><td><div style="text-align:center;">311</div></td></tr>

<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>256</b></div></td><td><div><a href="index.php?section=problems&amp;id=256" style="text-decoration:none;" title="Click to view problem">
Tatami-Free Rooms
</a></div></td><td><div style="text-align:center;">234</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>257</b></div></td><td><div><a href="index.php?section=problems&amp;id=257" style="text-decoration:none;" title="Click to view problem">
Angular Bisectors
</a></div></td><td><div style="text-align:center;">225</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>258</b></div></td><td><div><a href="index.php?section=problems&amp;id=258" style="text-decoration:none;" title="Click to view problem">
A lagged Fibonacci sequence
</a></div></td><td><div style="text-align:center;">373</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>259</b></div></td><td><div><a href="index.php?section=problems&amp;id=259" style="text-decoration:none;" title="Click to view problem">
Reachable Numbers
</a></div></td><td><div style="text-align:center;">396</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>260</b></div></td><td><div><a href="index.php?section=problems&amp;id=260" style="text-decoration:none;" title="Click to view problem">
Stone Game
</a></div></td><td><div style="text-align:center;">374</div></td></tr>

<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>261</b></div></td><td><div><a href="index.php?section=problems&amp;id=261" style="text-decoration:none;" title="Click to view problem">
Pivotal Square Sums
</a></div></td><td><div style="text-align:center;">209</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>262</b></div></td><td><div><a href="index.php?section=problems&amp;id=262" style="text-decoration:none;" title="Click to view problem">
Mountain Range.
</a></div></td><td><div style="text-align:center;">242</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>263</b></div></td><td><div><a href="index.php?section=problems&amp;id=263" style="text-decoration:none;" title="Click to view problem">
An engineers’ dream come true
</a></div></td><td><div style="text-align:center;">302</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>264</b></div></td><td><div><a href="index.php?section=problems&amp;id=264" style="text-decoration:none;" title="Click to view problem">
Triangle Centres
</a></div></td><td><div style="text-align:center;">200</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>265</b></div></td><td><div><a href="index.php?section=problems&amp;id=265" style="text-decoration:none;" title="Click to view problem">
Binary Circles
</a></div></td><td><div style="text-align:center;">961</div></td></tr>

<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>266</b></div></td><td><div><a href="index.php?section=problems&amp;id=266" style="text-decoration:none;" title="Click to view problem">
Pseudo Square Root
</a></div></td><td><div style="text-align:center;">409</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>267</b></div></td><td><div><a href="index.php?section=problems&amp;id=267" style="text-decoration:none;" title="Click to view problem">
Billionaire
</a></div></td><td><div style="text-align:center;">713</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>268</b></div></td><td><div><a href="index.php?section=problems&amp;id=268" style="text-decoration:none;" title="Click to view problem">
Counting numbers with at least four distinct prime factors less than 100
</a></div></td><td><div style="text-align:center;">360</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>269</b></div></td><td><div><a href="index.php?section=problems&amp;id=269" style="text-decoration:none;" title="Click to view problem">
Polynomials with at least one integer root
</a></div></td><td><div style="text-align:center;">222</div></td></tr>

<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>270</b></div></td><td><div><a href="index.php?section=problems&amp;id=270" style="text-decoration:none;" title="Click to view problem">
Cutting Squares
</a></div></td><td><div style="text-align:center;">228</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>271</b></div></td><td><div><a href="index.php?section=problems&amp;id=271" style="text-decoration:none;" title="Click to view problem">
Modular Cubes, part 1
</a></div></td><td><div style="text-align:center;">495</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>272</b></div></td><td><div><a href="index.php?section=problems&amp;id=272" style="text-decoration:none;" title="Click to view problem">
Modular Cubes, part 2
</a></div></td><td><div style="text-align:center;">237</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>273</b></div></td><td><div><a href="index.php?section=problems&amp;id=273" style="text-decoration:none;" title="Click to view problem">
Sum of Squares
</a></div></td><td><div style="text-align:center;">353</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>274</b></div></td><td><div><a href="index.php?section=problems&amp;id=274" style="text-decoration:none;" title="Click to view problem">
Divisibility Multipliers
</a></div></td><td><div style="text-align:center;">427</div></td></tr>

<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>275</b></div></td><td><div><a href="index.php?section=problems&amp;id=275" style="text-decoration:none;" title="Click to view problem">
Balanced Sculptures
</a></div></td><td><div style="text-align:center;">200</div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>276</b></div></td><td><div><a href="index.php?section=problems&amp;id=276" style="text-decoration:none;" title="Click to view problem">
Primitive Triangles
</a></div></td><td><div style="text-align:center;">271</div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>277</b></div></td><td><div><a href="index.php?section=problems&amp;id=277" style="text-decoration:none;" title="Click to view problem">
A Modified Collatz sequence
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=277" title="View the fastest 20 solvers">675
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>278</b></div></td><td><div><a href="index.php?section=problems&amp;id=278" style="text-decoration:none;" title="Click to view problem">
Linear Combinations of Semiprimes
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=278" title="View the fastest 20 solvers">260
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>279</b></div></td><td><div><a href="index.php?section=problems&amp;id=279" style="text-decoration:none;" title="Click to view problem">
Triangles with integral sides and an integral angle 
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=279" title="View the fastest 20 solvers">202
</a></div></td></tr>

<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>280</b></div></td><td><div><a href="index.php?section=problems&amp;id=280" style="text-decoration:none;" title="Click to view problem">
Ant and seeds
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=280" title="View the fastest 20 solvers">263
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>281</b></div></td><td><div><a href="index.php?section=problems&amp;id=281" style="text-decoration:none;" title="Click to view problem">
Pizza Toppings
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=281" title="View the fastest 20 solvers">236
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>282</b></div></td><td><div><a href="index.php?section=problems&amp;id=282" style="text-decoration:none;" title="Click to view problem">
The Ackermann function
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=282" title="View the fastest 20 solvers">238
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>283</b></div></td><td><div><a href="index.php?section=problems&amp;id=283" style="text-decoration:none;" title="Click to view problem">
Integer sided triangles for which the  area/perimeter ratio is integral.
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=283" title="View the fastest 20 solvers">201
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>284</b></div></td><td><div><a href="index.php?section=problems&amp;id=284" style="text-decoration:none;" title="Click to view problem">
Steady Squares
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=284" title="View the fastest 20 solvers">335
</a></div></td></tr>

<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>285</b></div></td><td><div><a href="index.php?section=problems&amp;id=285" style="text-decoration:none;" title="Click to view problem">
Pythagorean odds
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=285" title="View the fastest 20 solvers">290
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>286</b></div></td><td><div><a href="index.php?section=problems&amp;id=286" style="text-decoration:none;" title="Click to view problem">
Scoring probabilities
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=286" title="View the fastest 20 solvers">430
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>287</b></div></td><td><div><a href="index.php?section=problems&amp;id=287" style="text-decoration:none;" title="Click to view problem">
Quadtree encoding (a simple compression algorithm)
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=287" title="View the fastest 20 solvers">340
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>288</b></div></td><td><div><a href="index.php?section=problems&amp;id=288" style="text-decoration:none;" title="Click to view problem">
An enormous factorial
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=288" title="View the fastest 20 solvers">288
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>289</b></div></td><td><div><a href="index.php?section=problems&amp;id=289" style="text-decoration:none;" title="Click to view problem">
Eulerian Cycles
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=289" title="View the fastest 20 solvers">119
</a></div></td></tr>

<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>290</b></div></td><td><div><a href="index.php?section=problems&amp;id=290" style="text-decoration:none;" title="Click to view problem">
Digital Signature
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=290" title="View the fastest 20 solvers">216
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>291</b></div></td><td><div><a href="index.php?section=problems&amp;id=291" style="text-decoration:none;" title="Click to view problem">
Panaitopol Primes
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=291" title="View the fastest 20 solvers">298
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>292</b></div></td><td><div><a href="index.php?section=problems&amp;id=292" style="text-decoration:none;" title="Click to view problem">
Pythagorean Polygons
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=292" title="View the fastest 20 solvers">163
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>293</b></div></td><td><div><a href="index.php?section=problems&amp;id=293" style="text-decoration:none;" title="Click to view problem">
Pseudo-Fortunate Numbers
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=293" title="View the fastest 20 solvers">443
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>294</b></div></td><td><div><a href="index.php?section=problems&amp;id=294" style="text-decoration:none;" title="Click to view problem">
Sum of digits - experience #23
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=294" title="View the fastest 20 solvers">183
</a></div></td></tr>

<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>295</b></div></td><td><div><a href="index.php?section=problems&amp;id=295" style="text-decoration:none;" title="Click to view problem">
Lenticular holes
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=295" title="View the fastest 20 solvers">104
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>296</b></div></td><td><div><a href="index.php?section=problems&amp;id=296" style="text-decoration:none;" title="Click to view problem">
Angular Bisector and Tangent
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=296" title="View the fastest 20 solvers">135
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>297</b></div></td><td><div><a href="index.php?section=problems&amp;id=297" style="text-decoration:none;" title="Click to view problem">
Zeckendorf Representation
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=297" title="View the fastest 20 solvers">394
</a></div></td></tr>
<tr class="bg_table_row2"><td style="height:40px;"><div style="text-align:center;"><b>298</b></div></td><td><div><a href="index.php?section=problems&amp;id=298" style="text-decoration:none;" title="Click to view problem">
Selective Amnesia
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=298" title="View the fastest 20 solvers">129
</a></div></td></tr>
<tr class="bg_table_row1"><td style="height:40px;"><div style="text-align:center;"><b>299</b></div></td><td><div><a href="index.php?section=problems&amp;id=299" style="text-decoration:none;" title="Click to view problem">
Three similar triangles
</a></div></td><td><div style="text-align:center;"><a href="index.php?section=fastest_solvers&amp;id=299" title="View the fastest 20 solvers">87
</a></div></td></tr>


